Adding BluetoothAdapter setState

It's now possible to set the ShadowBluetoothAdapter in a specific
state and getState will return that value.
Adding @Implement checkBluetoothAddress

Adding @Implement for static checkBluetoothAddress method in
BlutoothAdapter. This is coming directly from Android source
code.
Merge branch 'bluetooth' of https://github.com/lixar/robolectric into lixar-bluetooth
Merge branch 'master' of https://github.com/pivotal/robolectric